JP5413871B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device, and more particularly, to a lighting device having a repellent effect against insects.

  A phenomenon in which an organism moves in a certain direction against an external stimulus is called chemotaxis. For example, moths and other insects have the ability to fly toward the light. Therefore, many insects may gather in the light of vending machines and street lights at night. A kidnapping lamp is a lighting device that utilizes this light-walking property of insects. For example, fluorescent lamps, black lights, high-pressure mercury lamps, and the like that attract and kill pests have been developed. If this kidnapping lamp is installed in the vicinity of the entrance of the store and lights up at night, moths and worms can be attracted and killed. As a result, it is possible to avoid the insect from entering the store by attracting the insect to the kidnapping lamp.

  By the way, the reason why insects gather in the lighting device is as follows. Insects generally respond to ultraviolet radiation between 360 nm and 380 nm. For example, a fluorescent lamp is a low-pressure mercury vapor discharge lamp having a hot cathode, and ultraviolet light generated by the discharge is converted into visible light by a fluorescent material applied to the inner wall of a glass tube. That is, the wavelength range of the ultraviolet light for exciting the fluorescent substance in the fluorescent lamp overlaps with the visual peak of the insect and gathers the insect.

  In other words, since both fluorescent lamps and kidnapping lamps as luminaires emit ultraviolet light that reacts with insects, both luminaires attract insects. Therefore, when installing a kidnapping lamp, place a kidnapping lamp between the outdoor and indoor fluorescent lamps, that is, if both lighting fixtures are positioned so that they reach the fluorescent lamp via the kidnapping lamp in the insect flying path, Insects can be attracted to a kidnap lamp and killed, and insects can be prevented from proceeding indoors. However, some insects may not reach the fluorescent lamp in the room without being attracted by the kidnapping lamp, and the insect that has advanced into the room is uncomfortable without leaving the vicinity of the fluorescent lamp. On the other hand, scenes of insects crowding on kidnapping lights often cause discomfort.

  On the other hand, a lighting device has been developed that does not attract insects, that is, has a repellent effect against insects. For example, it is disclosed that the light emitting device and the lighting device of Patent Document 1 have a high repellent effect against pests. FIG. 9 shows a side view of the lighting device 800. The lighting device 800 includes a first light emitting diode 801 and a second light emitting diode 802 mounted on a substrate 805. The first light emitting diode 801 emits light having an emission peak at a wavelength of 700 nm to 800 nm. Further, the second light emitting diode 802 emits light having a light emission peak in a shorter wavelength range than the first light emitting diode 801 and in a wavelength range of 580 nm or more.

  In the lighting device 800 of FIG. 9, the reaction of the chromoprotein that regulates flowering and growth of plants is controlled by the light emitted from the first light emitting diode 801. Furthermore, since the emission light region of the second light emitting diode 802 is a light wavelength region that a night owl dislikes, the activity of the night mist can be reduced to avoid the plant from the night mist. That is, it is possible to obtain a night owl repellent effect and a plant growth promoting effect with a single lighting device.

  FIG. 10 is a graph showing the relationship between the wavelength and the relative radiation intensity in the illumination device 800. As shown in FIG. 10, the lighting device 800 does not have a spectrum in the wavelength region on the short wavelength side caused by attracting insects, and the emitted wavelength is limited to the wavelength region in which the above insect-proof effect is remarkable. Yes. Accordingly, the spectrum shape is steep and a linear spectrum with a narrow half-value width is obtained, and as a result, light having a low color rendering property is obtained. For example, if an illumination device 800 having such a wavelength range is applied to a general indoor illumination device, the emitted light becomes monochromatic light and white light cannot be reproduced. Therefore, there is a problem that under such a light source, the color of the object looks unnatural and cannot be used as an indoor white illumination light source.

That is, a fluorescent lamp, which is a general lighting fixture, may attract insects. On the other hand, if it is a lighting device such as Patent Document 1 that emits light having a wavelength that excludes the visual reaction area of insects, insect repellent Although the effect is enhanced, the color rendering property is remarkably low, so that it is difficult to use it as an indoor lighting fixture.
JP 2004-93 A

  The present invention has been made to solve the conventional problems. A main object of the present invention is to provide an illumination device capable of emitting white light suitable for indoor use while having an effective repellent effect against insects.

In order to achieve the above object, a first lighting device of the present invention includes a plurality of first light emitting elements 11 capable of emitting light having a peak wavelength of 400 nm to 500 nm, and the first light emitting elements 11. A lighting device capable of emitting white light that has an effect of repelling insects and that absorbs at least part of the light and can fluoresce yellow light, and has a wavelength longer than 500 nm Are provided with a plurality of second light emitting elements 21 having a peak wavelength. The first light-emitting elements 11 are larger than the second light-emitting elements 21 in terms of the number of mounted light sources or the relative light emission intensity. The first light-emitting elements 11 are arranged at substantially equal intervals, and the second light-emitting elements 21 are The first light emitting elements 11 are arranged so as to be distributed substantially evenly, and the first light emitting elements 11 are arranged between the second light emitting elements 21, and the second light emitting elements 21. The relative radiant intensity at the peak wavelength is 5% or more and 20% or less with respect to the relative radiant intensity at the peak wavelength of the first light emitting element 11 .

  In the second lighting device, the distance between the second light emitting elements 21 is substantially constant, and a plurality of first light emitting elements 11 are arranged between the second light emitting elements 21. The number of mounted first light emitting elements 11 arranged between the two light emitting elements 21 is substantially constant.

  The third lighting device is characterized in that the second light emitting element 21 has a peak wavelength in at least one wavelength region selected from the group consisting of visible light yellow or red, or infrared region.

Further, the fourth lighting device is characterized in that the total number of the second light emitting elements 21 is 5% or more and 14% or less with respect to the total number of the first light emitting elements 11.

Further, the fifth lighting device is characterized in that the first light emitting element 11 and / or the second light emitting element 21 is formed of a light emitting diode.

Furthermore, the sixth lighting device includes a transmissive member 13 that covers the first light emitting element 11 and the second light emitting element 21 and scatters light.

The seventh illumination device further includes a substrate 3 on which at least one second light emitting element 21 is mounted at a predetermined position in a state where the plurality of first light emitting elements 11 are arranged in a dot matrix. In addition, the second light emitting elements 21 have substantially the same separation distance, and the second light emitting elements 21 are positioned substantially symmetrically with respect to the center of the light emitting region on the substrate 3.

  The illuminating device of the present invention does not reduce the wavelength region that has an attracting action on insects, but actively utilizes this wavelength region and further mixes light of a specific wavelength at a predetermined ratio. The repellent effect for can be enhanced. In addition, it is possible to provide an illuminating device that has a natural color rendering with a natural appearance even under a light source. In addition, the arrangement pattern in which the first light emitting element is mounted between the second light emitting elements can avoid the second light emitting element from being excessively close to each other, and the light emission intensity from the second light emitting element is increased. It is never done. That is, it is possible to improve the uniformity of the emission color from the first light-emitting element and the emission color from the second light-emitting element having a hue different from that of the first light-emitting element, thereby reducing color unevenness in the mixed color light. In particular, by providing a plurality of the first light emitting elements arranged between the second light emitting elements, it is possible to relatively reduce the component ratio of the emission color related to the second light emitting elements, The color unevenness in the mixed colors can be further avoided.

  According to the third aspect of the invention, the repellent effect against insects can be improved, and the hue due to the color mixture of each component light emitted from the first and second light emitting elements can be made suitable as illumination light. In particular, if the peak wavelength of the second light emitting element is set to the long wavelength side of visible light, the mixed color light can be converted into warm white light, and illumination light with further excellent color rendering can be obtained.

Further, according to the first and fourth inventions, the color mixing ratio of the component light per unit area in the light emitting region is substantially constant by specifying the blending ratio of each component light constituting the mixed color light while enjoying the above effect. And can. As a result, color unevenness of light emitted from the illumination device can be reduced.

According to the fifth aspect of the present invention, the light emitting element is formed of a light emitting diode, so that light emission with a small size, high power efficiency, and vivid color can be realized. In addition, there is no fear of running out of the ball, and the initial drive characteristics are excellent, and it has a strong effect on vibration and repeated on / off lighting.

Furthermore, according to the sixth aspect of the invention, the light emitted from the light emitting element is transmitted through the transmissive member, so that the light can be scattered and the diffusibility can be increased. As a result, the color mixing property of each component light is increased. The color unevenness of the emitted light from can be reduced.

Further, according to the seventh invention, the color mixing property of each component light per unit area can be made substantially constant, and the light emitting areas of various sizes can be dealt with by connecting the substrates.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a lighting device for embodying the technical idea of the present invention, and the present invention does not specify the lighting device as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the embodiments are indicated in the “claims” and “means for solving problems” sections. It is appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely explanations. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

(Embodiment 1)
FIG. 1 is an exploded perspective view of a lighting device 1 according to Embodiment 1. FIG. It is also a block diagram showing a connection state with an external power supply or a controller. The illuminating device 1 shown in FIG. 1 includes a light source 2 composed of a plurality of light emitting elements 10 that emit light, and a transmissive member 13 that covers the light source 2. The light source 2 is connected to the power source PS via the controller 5 and receives supply of driving power therefrom. When the controller 5 receives power from the power source PS and energizes the light emitting element 10, the light emitted from the light source 2 travels upward, passes through the transmission member 13, and is emitted to the outside of the illumination device 1.

  The light emitting element 10 includes a first light emitting element 11 and a second light emitting element 21 having different peak wavelengths of emitted light. The number of the first light emitting elements 11 mounted on the lighting device 1 is larger than the number of the second light emitting elements 21 mounted. Further, the first light emitting element 11 can emit light having a peak wavelength in the range of 400 nm to 500 nm, and further contains a phosphor that is excited by absorbing at least a part of the emitted light and can be fluorescent in yellow. On the other hand, the second light emitting element 21 has a peak wavelength on the longer wavelength side than 500 nm. The first light emitting element 11 is larger in relative light emission intensity than the second light emitting element 21. Hereinafter, each member will be described in detail.

(light source)
The light source 2 according to Embodiment 1 is a collection of a plurality of light emitting elements 10 which are point light sources. As the light emitting element 10, various illumination lights such as discharge light emission and electroluminescence can be used. Specific examples include semiconductor elements such as LEDs and LDs, organic EL, and fluorescent lamps using luminescence. In the example of FIG. 1, a light emitting diode (LED) is employed as the light emitting element 10. As a result, it can be driven at a low voltage and a low current, so that power consumption can be suppressed and durability and reliability can be improved. In addition, since power consumption can be reduced, it is possible to consider the global environment in addition to reducing running costs. In addition, the LED is robust and excellent in impact resistance, and can be used stably and strongly against mechanical impacts, and since it has a long life, it can reduce labor and cost of replacing the light source, and can realize maintenance-free. Furthermore, since the calorific value is small, the thermal influence on the surrounding members is relatively small.

  In addition, since the LED is a current control element, the amount of light emission can be adjusted by the amount of current, and the output linearity is excellent and preferable. The shape of the LED according to Embodiment 1 is not particularly limited, and various LEDs such as a shell type and a surface mount type (SMD type) can be employed. For example, if a surface mount type is used, a thin lighting device can be realized.

  The first light-emitting element 11 has a light emission layer having a light emission peak wavelength of 400 nm to 500 nm, particularly 450 nm to 480 nm, more preferably 460 nm to 470 nm, and capable of emitting light having a light emission wavelength capable of efficiently exciting the fluorescent substance. It is preferable to have. This is because the luminous efficiency of the phosphor can be increased by using an excitation light source in this range. The light in the above wavelength range is mainly in the blue light region.

The blue light absorbed by the phosphor in the first light emitting element 11 serves as an excitation source and emits yellow fluorescence. This yellow light and blue light are mixed and appear as white to the human eye. For example, a blue light emitting element using an InGaN-based material is used as the light emitting element, and a phosphor is thinly coated on the surface of the blue light emitting element. As this phosphor, a YAG phosphor represented by a composition formula of (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce can be used.

  FIG. 2 is a spectrum diagram showing the wavelength of the emitted light related to the first light emitting element 10. As shown in FIG. 2, the first light emitting element 11 has a peak wavelength in a blue wavelength range of 400 nm to 500 nm by a light emitting diode and a yellow wavelength range of 500 nm to 600 nm by a phosphor. In other words, the first light emitting element 11 emits the emitted light having a white color from the entire light emitting element 11 by mixing these hues.

  Incidentally, FIG. 3 shows data relating to the wavelength corresponding to the blue light emitting region of the first light emitting element 11 and the insect attracting rate. Specifically, FIG. 3 is a graph comparing the number of insects attracted by LED light emitting blue light alone and each LED light (purple, green, yellow, red yellow, red) exhibiting another single color. . Similar observations are made for white LED light, and the results are also shown in FIG. FIG. 3 shows that insects tend not to be attracted by long-wavelength light. On the other hand, light on the short wavelength side has a remarkable insect attracting action, and in particular, purple and blue light have a higher attracting rate than other monochromatic lights.

  The illuminating device of the first embodiment actively uses the first light emitting element 11 that emits blue light having a high attracting rate of insects, and further sets the second peak wavelength region with a predetermined amount of light. It is characterized by mixing. In other words, unlike the conventional method of reducing the wavelength region where the insect attracting rate is high, this wavelength region is used as the component light of the emitted light as it is, and the wavelength light of other hues is mixed and added at a specific blending ratio. The repellent effect is enhanced, which is based on completely new knowledge.

  Specifically, FIG. 4 is an example of a light wavelength added to the light wavelength of FIG. 2, and each wavelength is constituted by light emitted from the second light emitting element 21. In the drawing, each waveform having a peak wavelength at 580 nm (yellow), 620 nm (red), or 700 nm (infrared) is shown as an example, but the second light emitting element 21 has at least one peak on the longer wavelength side than 500 nm. As long as it has a wavelength, it is not limited to the waveform in the figure.

  Further, the relative radiation intensity at the peak wavelength of the first light emitting element 11 is larger than the relative radiation intensity at the peak wavelength of the second light emitting element 21. Specifically, as shown in FIGS. 2 and 4, the relative radiant intensity P2 (see FIG. 4) of the peak wavelength of the second light emitting element 21 is the relative radiant intensity P1 (see FIG. 4) of the first light emitting element 11. It is preferable that it is 5% or more and 20% or less with respect to FIG. By specifying the ratio of the color mixture by each component light from the first light-emitting element 11 and the second light-emitting element 21 within this range, an effective insect-proofing effect is exhibited and the entire emitted light from the lighting device 1 is reduced. Color rendering properties are improved, and color unevenness of mixed color light can be reduced, which is preferable. That is, even when used indoors, it is possible to provide a lighting device that can naturally see the color of an object under a light source and that satisfies both the insect repellent effect.

  The second light emitting element 21 only needs to have at least one peak wavelength on the longer wavelength side than 500 nm. However, in addition to this, two or more peak wavelengths may be provided. Alternatively, a third light-emitting element having a wavelength range different from that of the second light-emitting element and having a peak wavelength of 500 nm or more may be added.

(Ratio of light emitting element array and number of mounted elements)
The arrangement state of the light emitting elements 10 will be described below. The first light emitting element 11 and the second light emitting element 21 are arranged at equal intervals between adjacent light emitting elements in the arrangement pattern of the respective light emitting elements, thereby improving the uniformity of arrangement. Specifically, the first light emitting elements 11 are arranged at substantially equal intervals, and the second light emitting elements 21 are arranged so as to be distributed substantially evenly with respect to the first light emitting elements 11. That is, in the light emitting region constituted by the entire assembly of light emitting elements, the distance between the second light emitting elements is substantially constant, and the ratio of the number of both light emitting elements mounted per unit area can be substantially constant.

  More specifically, the first light emitting element is interposed between the arbitrary second light emitting elements 21, that is, the second light emitting elements 21 are not adjacently arranged. In addition, the number of the first light emitting elements 11 disposed between the second light emitting elements 21 is substantially constant between any second light emitting elements 21. In other words, the first light emitting element group is divided substantially evenly by the second light emitting element in the arrangement region or the arrangement number.

  Thus, by increasing the uniformity of the arrangement of the light emitting elements, the color mixing property of each hue contributed by the light emitted from each light emitting element can be improved, and as a result, the color unevenness in the entire mixed color can be reduced. preferable. However, “equal intervals” in this specification means that the distances between adjacent light emitting elements of the same type are equal, and the distance in this case is applicable to the distance between different types of light emitting elements. Not. “Same type” means that the spectral wavelength shapes are similar.

  In the example of FIG. 1, the mounting region of the light emitting elements on the substrate 3 is a rectangular light emitting region, and a plurality of first light emitting elements 11 are arranged in a dot matrix within this light emitting region. Adjacent first light emitting elements 11 are substantially equally spaced. Further, the second light emitting elements 21 are mounted on the substrate 3, and the total number of the second light emitting elements 21 is 5% to 14% of the total number of the first light emitting elements 11. In the first and second light emitting elements, in addition to the ratio of the light amount based on the emission peak value, by defining the ratio of the total number of mounted elements within this range, the color rendering property and insect-proof effect of the lighting device can be further enhanced. The color unevenness of the whole light from the lighting device 1 can be further reduced.

  Furthermore, it is preferable that the second light-emitting elements 21 are evenly distributed in the light-emitting region so that the arbitrary second light-emitting elements 2 are equally spaced from each other and the arrangement positions are substantially symmetrical. Specifically, FIG. 5 is an explanatory diagram showing an example of the arrangement of the light emitting elements 10. Specifically, FIG. 5A shows a total of nine first light emitting elements 11 of 3 rows × 3 columns arranged in a matrix and is referred to as a light emitting element group 4 (rectangular broken line portion in the figure) for convenience. To do. The second light-emitting elements 21 are arranged between the light-emitting element groups 4, and as shown by the alternate long and short dash line in FIG. 5A, the line connecting the adjacent second light-emitting elements 21 is zigzag. It is mounted to bend. More specifically, the second light emitting element 21 is positioned substantially symmetrically with respect to a center line passing through the center of the light emitting region.

  Further, in the light emitting region of the light source corresponding to the mounting region of the light emitting element 10, the ratio of the number of mounted first light emitting elements 11 and second light emitting elements 21 per unit area is made substantially constant. Thereby, the blending ratio of the second light quantity in the emitted light from the first light emitting element 11 can be made substantially constant without uneven distribution, and as a result, the color unevenness of the mixed color light can be reduced, which is preferable.

  For example, in the example of FIG. 1, the light source 2 in which the red light of the second light emitting element 21 is further distributed at a substantially constant interval in a white base light emitting region constituted by the first light emitting element 11. it can. As a result, the red light is evenly scattered in the white light having a large light emitting area, and the uneven distribution of the red light can be avoided and the color unevenness in the entire mixed color light can be reduced.

  5A, since the second light emitting elements 21 are arranged so as to pass between the first light emitting elements 11 for white, the mounting location of the second light emitting elements 21 is It can be various without depending on the first light emitting element 11. Alternatively, since it is possible to add only the second light emitting element 21 using an existing white lighting device, it is possible to easily impart an insect-proof function to the conventional lighting device.

  FIG. 5B shows an arrangement in which a part of the light emitting element group 4 is replaced with the second light emitting element 21. Specifically, in the rectangular shape of the light emitting element group 4, the first light emitting element 11 located in the center part on the edge side is replaced with the second light emitting element 21. As shown by the alternate long and short dash line, the entire arrangement position of the second light-emitting elements 21 becomes a zigzag shape as in FIG. All the light emitting element groups 4 have the same element arrangement, and the adjacent light emitting element groups 4 are connected in an upside down posture. Therefore, in the arrangement form of FIG. 5B, the light emitting element group 4 is set as one unit, and the unit number is changed by connecting them in a daisy chain in a state where every other unit is turned upside down. While the arrangement positions of the second light emitting elements 21 are made uniform, the light emitting areas of various sizes can be handled. Further, the connection state of the units is not limited to a linear shape, and may be a planar shape or a three-dimensional shape.

  The number of the light emitting elements 10 mounted in the light emitting element group 4 is not limited to the above. For example, as shown in FIG. 5 (c), the total number of light emitting elements 10 in one unit is arranged in a matrix form with a total of 25 rows of 5 rows × 5 columns, and both ends of one side of this rectangular shape are opposed to opposite sides. The second light-emitting element 21 is mounted in the center of the first, and the rest is the first light-emitting element 11. In the example of FIG. 5C, a plurality of second light emitting elements 21 are provided in one unit, and a light emitting area can be earned with one unit. As described above, the arrangement method is not limited as long as the ratio between the total number of mounted light emitting elements and the amount of light satisfies the above range.

(Transparent member)
Further, the transmissive member 13 covering the upper part of the light source 2 is configured to transmit at least a part of the emitted light of the light emitting element 10 as shown in FIG. Although the shape of the transmissive member 13 is not particularly limited, it is preferable to cover the light-emitting element 10 so as to face at least the light-emitting area side of the light source 2 and to cover the upper side of the light-emitting area so that at least the emission surface of the light-emitting element 10 is not exposed.

  In the example of FIG. 1, for example, acrylic (PMMA resin) made of a transparent member is injection-molded to form a semicircular cross section, and this circular arc surface is fixed to the light source 2 as the light traveling direction. However, the material of the transmissive member 13 is not limited to this. In addition, the term “transparent” in the present specification is not limited to colorless, and includes at least translucent and translucent that can transmit part of light.

  Further, the transmissive member 13 preferably has high light diffusibility. As a result, the directivity of each component light passing through the transmission member 13 is reduced, that is, the light scattering property is improved and the color mixing property is further increased. As a result, the color unevenness is extremely reduced. In addition, the viewing angle can be increased. As an example, an infinite number of irregularities such as a textured surface (texture surface) may be formed at a constant pitch or randomly on at least the emission surface side of the transmission member 13 to form a light scattering surface. Alternatively, light scattering ink made of magnesium carbonate, titanium oxide or the like as a pigment may be attached to the transmissive member 13. Further, the light emitting element 10 itself can contain a diffusing material.

(Electrical system)
The controller 5 in FIG. 1 includes a switch that can switch ON / OFF of the light emitting element 10. Further, the controller 5 can be provided with a variable resistor, whereby the amount of current supplied to the light emitting element 10, the ON duty or OFF duty, the number of lighting pulses, the lighting cycle (frequency), and the like can be adjusted. As a result, it is possible to control the ratio of the component light between the first light emitting element 11 and the second light emitting element 21 by changing the light emission characteristics of the light emitting element 10 such as the light emission form, the amount of light, and the luminance. In the illustrated example, the controller 5 is used together as a power connector with the power source PS, but the configuration is not limited to this configuration, and a mode in which a switch is separately provided may be used. Further, the controller 5 may incorporate a converter or a transformer that can convert the supplied current into the LED driving current.

  The controller 5 is configured to be connected to an external power source PS to be supplied with power. As the power source PS, a commercial power source such as AC100V or a battery such as a battery can be used. In particular, the use of a rechargeable battery is preferable because it can supply power to the light source 2 cordlessly. The rechargeable battery can be charged by a contactless charging method using electromagnetic induction or the like, in addition to a priority connection method in which a power line is connected to the power source PS.

  In the following Examples 1 to 4, the first light-emitting element 11 is commonly used as the first LED 11a that emits white light having the spectrum shown in FIG. 2, and the second light-emitting element 21 having various peak wavelengths is used. The second LED 21a was combined with each other, and the insect attracting rate was measured. The relative intensity at the peak wavelength of the second LED 21a is about 20% of the relative intensity at the peak wavelength of the first LED 11a. Moreover, the comparative example 1 is different from the 1st LED 11a of Examples 1-4 in the white light emission LED used for the conventional illuminating device which used the fluorescent lamp for the comparative example 2, and is red, green, and blue. A full color LED 11b is used in which each color is composed of LEDs and each emission color is mixed to obtain white.

  In Examples 1 to 4 and Comparative Example 2 using LEDs, as shown in FIG. 6, a total of 16 first LEDs 11a or full color LEDs 11b that emit white light are arranged in a 4 × 4 column in a dot matrix. The second LED 21a was appropriately combined with this central area. Specifically, the second LED 21a of Example 1 emits red light and has a peak wavelength of 620 nm. In Example 2, the second LED 21a is not used, and only the first LED 11a is used. Further, in Example 3, the second LED 21a is green light emitting and has a peak wavelength at 528 nm, and the second LED 21a in Example 4 is blue light emitting and has a peak wavelength at 468 nm. . FIG. 7 shows the attracting arguments of insects per unit time in the respective emission wavelength ranges of Comparative Examples 1-2 and Examples 1-4.

  From FIG. 7, it was found that the LED attracting argument can be reduced by 65% or more in the case of the LED (Comparative Example 2, Examples 1 to 4) compared to the fluorescent lamp (Comparative Example 1). Further, the first LED 11a (Examples 1 to 4) exhibits a further repellent effect as compared with the full-color LED 11b (Comparative Example 2). In consideration of this, it was confirmed that the repellent effect of insects was remarkably increased by mixing specific wavelengths (Example 1).

  FIG. 8 shows spectral data of light emitted from a lighting device to which a wavelength region of 500 nm or more having a high repelling effect is added in addition to a white light source. Specifically, in this illuminating device, 11 red second LEDs 21a corresponding to Example 1 are arranged substantially equally spaced from 88 first LEDs 11a exhibiting white. More specifically, a group of LEDs arranged in a matrix of 3 rows × 3 columns is made into one group, and one second LED 21a is mounted at the center, and eight second LEDs 21a are surrounded so as to surround the second LED 21a. 1 LED 11a was arranged. That is, in the mounting ratio of each LED, the number of mounted second LEDs 21a is 12.5% of the number of mounted first LEDs 11a (second LED 21a: first LED 11a = 1: 8). The lighting device was configured by arranging 11 groups in parallel in one direction. Further, the rated output per one of the first LEDs 11a contributing to white light is 0.036 W (3.6 V, 10 mA) and the duty ratio is 50%, and the rated per one of the second LEDs 21 a constituting the red light. The output was about 0.02 W (2.0 V, 10 mA) and the duty ratio was 50%.

  In this illuminating device, the spectrum emitted from the illuminating device under the condition that the rated voltage is supplied to the first LED 21a while the second LED 21a is supplied with a voltage of 20% of the rated voltage is shown in FIG. Shown in a). The spectrum was measured at a position 2.2 m away from the substrate on which the LED was mounted. As shown to Fig.8 (a), the radiation intensity of the wavelength range of 2nd LED21a is weighted to the wavelength range of 1st LED11a which comprises white light. Specifically, in the vicinity of 620 nm corresponding to the wavelength region of the second LED 21a, the added relative radiation intensity (P2) is about 12.1% with respect to the relative intensity (P1) of the peak wavelength of the first LED 11a. there were.

  Furthermore, FIG.8 (b) shows the spectrum of the light discharge | released from an illuminating device at the time of supplying rated power to both 1st LED11a and 2nd LED21a. That is, the wavelength of the emitted light in the illumination device when the average power supplied to the second LED 21a in FIG. 8A is increased from 100% to 100% from the rated voltage is shown. In the spectrum of FIG. 8B, it was confirmed that the intensity of the wavelength region in the added second light emitting element was increased as in FIG. 8A. Specifically, the added relative radiation intensity (P2) was about 18.9% with respect to the relative intensity (P1) of the peak wavelength of the first LED 11a. In addition, an increase in relative radiation intensity was observed also in the yellow emission region corresponding to the wavelength region of the phosphor. As a result, the peak wavelength (P1) of the first LED 11a located at 400 nm to 500 nm has a reduced ratio of relative radiation intensity compared to the peak wavelength located at the wavelength range (500 nm to 600 nm) of the phosphor. . This reduction in the ratio of component light in the blue wavelength region on the short wavelength side is considered to be effective for the repellent effect against insects.

  However, since the emitted light from the illumination device is a mixture of component lights having different hues, the wavelength shape may be slightly different depending on the measurement location. Therefore, the emitted light is not limited to the wavelength shape of FIG. Further, the higher the radiation intensity of the added second LED 21a, the stronger the repelling effect. On the other hand, if the ratio of the wavelength intensity to be added is high, the possibility of color unevenness due to color mixing with white light increases. From the viewpoint of uniform emission color, the relative emission of the peak wavelength of the second light emitting element 21 is achieved. The intensity (P2) is preferably 5% or more and 20% or less with respect to the peak wavelength (P1) of the first light emitting element 11. Alternatively, the total number of second light emitting elements (21) is preferably 5% or more and 14% or less with respect to the total number of first light emitting elements (11).

  Thus, while the lighting device according to the present embodiment has a wavelength range where the attracting rate of insects is high, it produces an effective repellent effect by mixing the light emission of a specific wavelength range by a predetermined ratio, White light emission can be realized. As a result, it is possible to provide an illuminating device having a high insect repellent action while maintaining color rendering. In particular, in a conventional lighting device having an insect-repellent effect, insects are prevented from gathering by reducing or eliminating the peak of the wavelength region corresponding to the visual reaction of insects. In other words, the spectrum corresponding to the wavelength range of the insect reaction zone was excluded. However, a light source composed of a wavelength region having a high repellent effect against insects has low color rendering properties, is difficult to use as a general lighting device, and has a problem that the range of use is remarkably limited. On the other hand, in the lighting device according to the present embodiment described above, the repelling effect is enhanced by adding a new spectrum without eliminating the spectral region having high color rendering properties, so the color rendering properties are sacrificed. Insect repellent action can be exhibited without any problems, and it can be suitably used as lighting for a wide range of applications.

  The lighting device of the present invention can be suitably used for indoor lighting devices and lighting for vending machines.

It is the disassembled perspective view and block diagram of the illuminating device which concern on Example 1. FIG. It is a spectrum figure which shows the wavelength of the emitted light which concerns on a 1st light emitting element. It is a graph regarding an attractive rate of a wavelength and an insect. An example of a spectrum of the second light-emitting element is shown. It is explanatory drawing which shows the arrangement | sequence form of a light emitting element. It is a simplified diagram which shows the arrangement | sequence form of LED which concerns on a comparative example and an Example. It is a graph which shows the relationship between the light emission wavelength range which concerns on a comparative example, and an Example, and the attracting argument of an insect. 3 is a graph showing a spectrum of light emitted from the illumination device according to Example 1. The side view of the conventional illuminating device is shown. It is a graph which shows the relationship between the wavelength and relative radiation intensity in the conventional illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illuminating device 2 ... Light source 3 ... Board | substrate 4 ... Light emitting element group 5 ... Controller 10 ... Light emitting element 11 ... 1st light emitting element 11a ... 2nd LED
11b ... Full color LED
13 ... Transparent member 21 ... Second light emitting element 21a ... Second LED
DESCRIPTION OF SYMBOLS 800 ... Illuminating device 801 ... 1st light emitting diode 802 ... 2nd light emitting diode 805 ... Board | substrate P1, P2 ... Relative radiation intensity PS ... Power supply

Claims (7)

A plurality of first light emitting elements (11) capable of emitting light having a peak wavelength at 400 nm to 500 nm;
A phosphor capable of absorbing yellow light by absorbing at least part of the light from the first light emitting element (11);
An illuminating device capable of emitting white light having a repellent effect against insects,
And a plurality of second light emitting elements (21) having a peak wavelength longer than 500 nm.
The first light emitting element (11) is larger than the second light emitting element (21) in terms of the number of mounted or relative light emission intensity,
The first light emitting elements (11) are arranged at substantially equal intervals, and the second light emitting elements (21) are arranged substantially evenly distributed with respect to the first light emitting elements (11). And
Further, the first light emitting element (11) is disposed between the second light emitting elements (21) ,
Illumination characterized in that the relative radiant intensity at the peak wavelength of the second light emitting element (21) is not less than 5% and not more than 20% with respect to the relative radiant intensity at the peak wavelength of the first light emitting element (11). apparatus. The lighting device according to claim 1.
The separation distance between the second light emitting elements (21) is substantially constant,
Furthermore, a plurality of first light emitting elements (11) are arranged between the second light emitting elements (21),
The lighting device, wherein the number of mounted first light emitting elements (11) disposed between the second light emitting elements (21) is substantially constant. The lighting device according to claim 1 or 2,
The lighting device, wherein the second light emitting element (21) has a peak wavelength in at least one wavelength region selected from the group consisting of visible light yellow or red or infrared region. In the illuminating device as described in any one of Claim 1 thru | or 3 ,
The total number of the second light emitting elements (21) is 5% or more and 14% or less with respect to the total number of the first light emitting elements (11). In the illuminating device as described in any one of Claims 1 thru | or 4 ,
The lighting device, wherein the first light emitting element (11) and / or the second light emitting element (21) is formed of a light emitting diode. The lighting device according to any one of claims 1 to 5 , further comprising: a transmissive member (13) that covers the first light emitting element (11) and the second light emitting element (21) to scatter light. A lighting device comprising: In the illuminating device as described in any one of Claims 1 thru | or 6 ,
And a substrate (3) on which a plurality of the first light emitting elements (11) are arranged in a dot matrix and at least one of the second light emitting elements (21) is mounted at a predetermined position. And
The illuminating device, wherein the second light emitting element (21) is positioned substantially symmetrically with respect to the center of the light emitting region on the substrate (3).

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